SEKIU STP - Secondary Wastewater Treatment Plant in Port Angeles, Washington

SEKIU STP is a municipal wastewater treatment plant located in Port Angeles, Washington, United States. The facility serves a small population of 538 residents and operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal discharges to protect water quality. The plant has a designed capacity of 908.50 m³/day and currently treats an average daily flow of 378.54 m³/day. As a secondary treatment facility, it uses biological processes to remove organic matter and suspended solids, meeting the national minimum standards for wastewater treatment before discharge. The treated effluent is discharged into the marine environment near the Strait of Juan de Fuca, a critical waterway connecting Puget Sound to the Pacific Ocean. This coastal area supports diverse marine life, including salmon runs and orca populations, making proper treatment essential for ecosystem health.

The plant discharges into the Strait of Juan de Fuca, which connects to the Pacific Ocean. This marine environment supports ecologically sensitive species such as Chinook salmon and Southern Resident killer whales. The coastal location requires careful management of nutrients and pathogens to prevent harm to the local food web and recreational waters.